posted on 2020-02-28, 11:28authored byQingyu Wang, Zongren Peng, SJ Dodd, LA Dissado, NM Chalashkanov
As the main material of the converter transformer dry-type bushing, the dielectric properties of epoxy/crepe paper at different temperatures and frequencies are related to the electric field and thermal field distribution of the bushing, which directly affects the safe and stable operation of the bushing. Here we report the dielectric response of samples of dry-type bushing insulation measured at a range of temperatures appropriate to operation and down to frequencies below those usually used. A significant loss peak observed below power frequency is interpreted as originating from the charging of internal epoxy resin interfaces by the transport of charge carriers on structured paths in the epoxy-impregnated crepe paper layers. A simulation model is proposed that allows estimation of the space charge and field distribution at any given frequency.
History
Citation
IEEE Transactions on Dielectrics and Electrical Insulation ( Volume: 26 , Issue: 5 , Oct. 2019 )
Author affiliation
Department of Engineering
Version
AM (Accepted Manuscript)
Published in
IEEE Transactions on Dielectrics and Electrical Insulation
Volume
26
Issue
5
Pagination
1532 - 1540
Publisher
Institute of Electrical and Electronics Engineers (IEEE)